[Lf] [Fwd: LF: LF Antenna.]

[Andre Kesteloot]

G4WGT wrote:

> Hello to you all,
>
> I am at the moment building a 300 watt Tx for 136 Khz, so I need to consider
> what to do about an Tx antenna for the band. I am receiving with a G3LNP
> balanced loop & pre-amp.
>
> My garden is quite small so the antenna will have to go upwards & give
> consideration to my neighbours. I have a 30 foot mast with a 4 Mtr beam, a
> VHF/UHF log periodic beam & VHF/UHF colinear vertical probably going up to
> 45 feet. I have thought of substituting these for a 6 foot x 2 inch
> fibreglass pole on top of my mast & using a similar arrangement to that
> described in the article by Alan Melia G3NYK & Finbar O'Conner EI0CF about
> spiral top loading. I can also wind inductance on the fibreglass pole to
> increase the top load inductance. What are your thoughts on this idea & if
> it sounds ok should I place the additional inductance above or below the
> spiral & if above what about an additional capacity hat on top of that. I
> will feed the device with a sloping vertical wire or on stand offs to keep
> the feed away from the mast & tuned at the bottom with a 12 inch diameter
> coil & variometer arrangement.
>
> Please give me your comments.
>
> Regards
>
> Gary (G4WGT)
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